A 3D printing apparatus, a spectacle lens and a method for manufacturing the same

Abstract

This invention discloses a 3D printing device, a spectacle lens, and a method for manufacturing the same. The device includes a base lens fixing structure, a triaxial control structure, a curing agent extrusion structure, a lens height positioning structure, and a curing structure. The base lens fixing structure is used to fix the base lens. The triaxial control structure is connected to the curing agent extrusion structure and is used to adjust the position of the curing agent extrusion structure. The curing agent extrusion structure contains a liquid curing material and includes a micro-injection pump, which extrudes microliter-level droplets of liquid curing material onto the surface of the base lens. The lens height positioning structure is connected to the micro-injection pump and is used to adjust the distance between the tip of the micro-injection pump and the surface of the base lens. The curing structure solidifies the liquid curing material droplets on the surface of the base lens into microlenses. This invention provides each patient with a custom-made lens with microlenses, reducing lens manufacturing costs and alleviating the financial burden on users.

Description

Technical Field

[0001] This invention relates to the field of 3D printing technology, and in particular to a 3D printing device, eyeglass lens, and a method for manufacturing the same. Background Technology

[0002] Currently, the microlens technology used to control myopia progression creates a region of increased optical power in a specific area, resulting in myopia defocus and effectively controlling myopia progression. Studies have shown that applying myopia defocus within a 10-20 degree range around the periphery of the retina yields the best results. However, individual differences in ocular structure, such as corneal curvature, corneal refractive power, and anterior chamber depth, can all affect the precise placement and effectiveness of the microlens.

[0003] Currently, the production of these lenses mainly relies on casting or molding techniques. These methods are not only costly but also difficult to personalize. Uniform molds cannot meet the fitting needs arising from individual differences, thus preventing the creation of microlens lenses perfectly suited to each patient's unique eye structure. This inability to accurately fit each patient's unique eye structure limits the maximization of lens efficacy and increases the financial burden on patients. Furthermore, the efficiency and cost-effectiveness of the manufacturing process are also problems that current methods urgently need to address. Summary of the Invention

[0004] This invention provides a 3D printing device, eyeglass lenses, and a method for manufacturing the same. The 3D printing device can provide each patient with a custom-made lens with microlenses, reducing the cost of manufacturing lenses and alleviating the financial burden on users.

[0005] According to one aspect of the present invention, a 3D printing device is provided, comprising a base lens fixing structure, a triaxial control structure, a curing agent extrusion structure, a lens height positioning structure, and a curing structure;

[0006] The base lens fixing structure is used to fix the base lens;

[0007] The triaxial control structure is connected to the curing agent extrusion structure and is used to adjust the position of the curing agent extrusion structure;

[0008] The curing agent extrusion structure contains a liquid curing material, and the curing agent extrusion structure includes a micro-injection pump, which is used to extrude microliter-level liquid curing material droplets onto the surface of the base lens.

[0009] The lens height positioning structure is connected to the micro-injection pump and is used to adjust the distance between the tip of the micro-injection pump and the surface of the base lens.

[0010] The curing structure is used to solidify the liquid curing material droplets on the surface of the base lens into microlenses.

[0011] Optionally, the micro-injection pump includes a first syringe and a second syringe, the volume of the first syringe is smaller than the volume of the second syringe, the output end of the first syringe is used to output microliter-level liquid solidification material droplets, and the output end of the second syringe is connected to the empty cylinder of the first syringe.

[0012] Optionally, the output end of the first syringe is provided with a first valve or a first blocking device, wherein the first valve or the first blocking device is closed when not extruding and open when extruding;

[0013] The output end of the second syringe is provided with a second valve or a second blocking device, which is open when not extruding and closed when extruding.

[0014] Optionally, the first syringe and the second syringe form a T-shaped or Y-shaped structure.

[0015] Optionally, the three-axis control structure can be a linear axis structure, a Delta-type structure, or a polar coordinate system structure.

[0016] The linear axis structure includes three sets of linear guides, each set of guides corresponding to a coordinate axis of a rectangular coordinate system, and movement along each axis is achieved through a stepper motor and a lead screw transmission mechanism;

[0017] The Delta-type structure includes three motors fixed to the top of the 3D printing equipment. By controlling the length changes of the three arms connected to the curing agent extrusion structure, the curing agent extrusion structure can be controlled in three-dimensional space.

[0018] The polar coordinate system structure is achieved by combining the rotation of the base lens with the movement of the curing agent extrusion structure along the radial direction of the base lens and at a height perpendicular to the surface of the base lens.

[0019] Optionally, the lens height positioning structure includes a distance sensor for determining the distance between the tip of the micro-injection pump and the surface of the base lens.

[0020] Optionally, the liquid-curing material includes photosensitive resin or thermosensitive resin.

[0021] Optionally, the liquid curing material includes a photosensitive resin, and the curing structure includes an ultraviolet light source; or the liquid curing material includes a thermosensitive resin, and the curing structure includes a heater.

[0022] According to a second aspect of the invention, an eyeglass lens is provided, comprising a base lens and a plurality of microlenses located on at least one side of the base lens.

[0023] According to a third aspect of the present invention, a method for manufacturing an eyeglass lens is provided, the eyeglass lens being manufactured using any of the 3D printing devices described in the first aspect, the manufacturing method comprising:

[0024] S1. Provide a basic lens;

[0025] S2. Fix the base lens onto the base lens fixing structure;

[0026] S3. The three-axis control structure adjusts the position of the curing agent extrusion structure so that the tip of the micro-injection pump contacts the surface of the base lens.

[0027] S4. The lens height positioning structure adjusts the distance between the tip of the micro-injection pump and the surface of the base lens at a preset distance.

[0028] S5. The micro-injection pump expels microliter-level liquid solidification material droplets onto the surface of the base lens.

[0029] S6. Repeat S3 to S5 to form multiple liquid solidification material droplets on the base lens;

[0030] S7. The curing structure solidifies the liquid curing material droplets on the surface of the base lens into microlenses.

[0031] The 3D printing equipment provided in this invention includes a base lens fixing structure, a triaxial control structure, a curing agent extrusion structure, a lens height positioning structure, and a curing structure. The triaxial control structure is connected to the curing agent extrusion structure, which includes a micro-injection pump. The lens height positioning structure is connected to the micro-injection pump. The base lens is fixed by the base lens fixing structure; the position of the curing agent extrusion structure is adjusted by the triaxial control structure; liquid curing material is disposed within the curing agent extrusion structure, and micro-volume-level droplets of liquid curing material are extruded onto the surface of the base lens by the micro-injection pump; the distance between the tip of the micro-injection pump and the surface of the base lens is adjusted by the lens height positioning structure; and the liquid curing material droplets on the surface of the base lens are solidified into microlenses by the curing structure, thereby providing each patient with a custom-made lens with microlenses, reducing lens manufacturing costs and alleviating the economic burden on users.

[0032] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 This is a schematic diagram of the structure of a 3D printing device provided in an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the structure of a micro-injection pump in a 3D printing device provided in an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of an extrusion quantity algorithm for liquid solidified material in a 3D printing device, provided as an embodiment of the present invention.

[0037] Figure 4 This is a top view diagram of a spectacle lens structure provided in an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the side view structure of an eyeglass lens provided in an embodiment of the present invention;

[0039] Figure 6 This is a flowchart illustrating a method for preparing an eyeglass lens according to an embodiment of the present invention. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0042] Figure 1 This is a schematic diagram of the structure of a 3D printing device provided in an embodiment of the present invention, with reference to... Figure 1 This invention provides a 3D printing device, including a base lens fixing structure 1, a three-axis control structure 2, a curing agent extrusion structure 3, a lens height positioning structure (not shown in the figure), and a curing structure (not shown in the figure). The base lens fixing structure 1 is used to fix the base lens 4. The three-axis control structure 2 is connected to the curing agent extrusion structure 3 and is used to adjust the position of the curing agent extrusion structure 3. Liquid curing material is disposed inside the curing agent extrusion structure 3, which includes a micro-injection pump. The micro-injection pump is used to extrude microliter-level liquid curing material droplets onto the surface of the base lens 4. The lens height positioning structure is connected to the micro-injection pump and is used to adjust the distance between the tip of the micro-injection pump and the surface of the base lens 4. The curing structure is used to solidify the liquid curing material droplets on the surface of the base lens 4 into microlenses.

[0043] This invention provides a 3D printing device. Currently, the most common type of 3D printer on the market is FDM (Fused Deposition Modeling), which is a process of creating three-dimensional objects by depositing molten thermoplastic filaments layer by layer.

[0044] FDM, also known as Fused Filament Fabrication (FFF), is a type of additive manufacturing (AM) that contrasts with subtractive manufacturing, such as machining, which creates objects by removing material. In FDM printing, filament is typically wound onto a spool and fed into a heated nozzle. The nozzle moves along an extrusion path created by slicing a 3D CAD file using modeling software. Invented by Scott Crump in 1988, this 3D printing technology is currently the most widely used technology in desktop and industrial 3D printers. FDM printers extrude molten plastic material through heated nozzles, then lay the material layer by layer, row by row.

[0045] In general, FDM printers build parts layer by layer through a predetermined path, which makes it much simpler to design and manufacture parts with complex geometries and internal cavities.

[0046] refer to Figure 1 This invention provides a 3D printing device, including a base lens fixing structure 1, a three-axis control structure 2, a curing agent extrusion structure 3, a lens height positioning structure (not shown in the figure), and a curing structure (not shown in the figure);

[0047] The base lens fixing structure 1 is used to fix the base lens 4, so that it is not easy to slip during the manufacturing of the base lens 4, thereby avoiding the problem of insufficient precision or substandard quality of the manufactured base lens 4.

[0048] The three-axis control structure 2 is connected to the curing agent extrusion structure 3 and is mainly used to adjust the position of the curing agent extrusion structure 3. The three-axis control structure 2 is responsible for achieving precise positioning of the curing agent extrusion structure 3 in three-dimensional space. The three-axis control structure 2 can make the curing agent extrusion structure 3 move precisely along the three coordinate axes XYZ so that the liquid curing material droplets are precisely extruded onto a specific area of ​​the extrusion lens 4.

[0049] The curing agent extrusion structure 3 contains a liquid curing material. The curing agent extrusion structure 3 includes a micro-injection pump, which is used to extrude microliter-level liquid curing material droplets onto the surface of the extruded lens 4.

[0050] Optionally, the liquid-curing material includes photosensitive resin or thermosensitive resin.

[0051] The lens height positioning structure is connected to the micro-injection pump and is used to adjust the distance between the micro-injection pump needle tip and the surface of the base lens 4. This lens height positioning structure is a device for precisely controlling the position of the micro-injection pump needle. This structure mimics the platform leveling technology of a 3D printer, enabling precise positioning of the needle tip to a specific area of ​​the base lens 4 for accurate extrusion of liquid solidified material droplets. Unlike traditional 3D printing which uses layer-by-layer stacking, in this embodiment, each extruded droplet forms a microlens.

[0052] Optionally, the lens height positioning structure includes a distance sensor used to determine the distance between the tip of the microinjection pump and the surface of the base lens. The distance sensor can be a device based on the Hall effect or other haptic feedback technology. Once the lens height positioning structure contacts the base lens 4, the distance sensor records the Z-axis position.

[0053] Optionally, the lens height positioning structure also includes a needle lifting control. After positioning, the needle can be precisely moved to the same height according to the recorded Z-axis position, and then slightly raised to maintain an appropriate distance from the base lens 4.

[0054] The working process of the lens height positioning structure is as follows:

[0055] 1. The lens height positioning structure slowly descends until it gently touches the surface of the base lens 4. At this time, the distance sensor records the Z-axis position.

[0056] 2. The lens height positioning structure and the needle tip are raised, and the needle tip moves to the same XY axis position.

[0057] 3. The needle slowly descends according to the recorded Z-axis position, and then rises slightly by a few micrometers to ensure an appropriate gap with the lens surface.

[0058] 4. The micro-injection pump begins to precisely extrude the liquid curing material onto the base lens 4.

[0059] The curing structure is used to solidify liquid curing material droplets on the surface of the base lens 4 into microlenses.

[0060] Optionally, the liquid curing material may include a photosensitive resin and the curing structure may include an ultraviolet light source, or the liquid curing material may include a thermosensitive resin and the curing structure may include a heater. The specific implementation can be selected according to the actual situation, and the embodiments of the present invention do not limit this.

[0061] Specifically, when the liquid-curing material is photosensitive resin, the curing structure is an ultraviolet light source. Photosensitive resin is a photosensitive material that transforms from a liquid to a solid state under irradiation with light of a specific wavelength. In 3D printing, photosensitive resin is a liquid composed of monomers and oligomers, which polymerizes into a solid state under ultraviolet light irradiation. When the liquid-curing material is thermosensitive resin, the curing structure is a heater. Thermosensitive resin undergoes a chemical change upon heating, gradually hardening and solidifying; it will not soften or dissolve upon further heating. The advantages of thermosensitive resin are high heat resistance and resistance to deformation under pressure.

[0062] The 3D printing equipment provided in this invention includes a base lens fixing structure, a triaxial control structure, a curing agent extrusion structure, a lens height positioning structure, and a curing structure. The base lens fixing structure is used to fix the base lens. The triaxial control structure is connected to the curing agent extrusion structure and is used to adjust the position of the curing agent extrusion structure. The curing agent extrusion structure contains liquid curing material and includes a micro-injection pump, which extrudes microliter-level droplets of liquid curing material onto the surface of the base lens. The lens height positioning structure is connected to the micro-injection pump and is used to adjust the distance between the tip of the micro-injection pump and the surface of the base lens. The curing structure solidifies the liquid curing material droplets on the surface of the base lens into microlenses. The 3D printing equipment provided by this invention can provide each patient with a custom-made lens with microlenses, reducing lens manufacturing costs and alleviating the financial burden on users.

[0063] Figure 2 This is a schematic diagram of a micro-injection pump in a 3D printing device according to an embodiment of the present invention. (Refer to...) Figure 2 Optionally, the micro-injection pump includes a first syringe 5 and a second syringe 6. The volume of the first syringe 5 is smaller than that of the second syringe 6. The output end 51 of the first syringe 5 is used to output microliter-level liquid solidification material droplets. The output end 61 of the second syringe 6 is connected to the empty cylinder of the first syringe 5.

[0064] Specifically, a microinjector is a tool capable of precisely controlling the injection of small volumes of liquid, typically used in laboratory research and certain specialized medical procedures. This type of injector allows for extremely fine volume control, often down to the microliter level, making it suitable for applications requiring exceptional precision. In ophthalmic surgery, microinjectors may be used to deliver drugs, nutrients, or other therapeutic substances, or, in gene therapy and cell therapy research, to precisely inject substances into cells. Their design typically ensures that the user can consistently control the injection speed and pressure for precise manipulation. Both the first injector 5 and the second injector 6 contain a movable plunger, whose movement is precisely controlled to extrude tiny droplets of liquid-solidified material onto the lens. The second injector 6 has a larger volume than the first injector 5, serving as a coarser syringe to store a larger amount of liquid-solidified material to support the material demands of continuous production processes.

[0065] Continue to refer to Figure 2 Optionally, the output end 51 of the first syringe 5 is provided with a first valve or a first blocking device 52, which is closed when not extruding and open when extruding; the output end 61 of the second syringe 6 is provided with a second valve or a second blocking device 62, which is open when not extruding and closed when extruding.

[0066] Specifically, the first valve or first blocking device 52 is closed when not extruding and opened when extruding; the second valve or second blocking device 62 is opened when not extruding and closed when extruding. The purpose of this is that when it is necessary to extrude liquid-curing material onto the lens surface, the first valve or first blocking device 52 is opened, so that the liquid-curing material is extruded from the inside of the first injector 5 in micro-liter increments to form droplets. At the same time, since the second valve or second blocking device 62 is in the closed state, it is ensured that the liquid-curing material is not squeezed into the second injector 6, thus avoiding waste. After the lens manufacturing is completed, the first valve or first blocking device 52 is closed, and the second valve or second blocking device 62 is opened at the same time, so that the liquid-curing material droplets stored inside the large-volume second injector 6 flow into the first injector 5, ensuring that the demand for liquid-curing material droplets during continuous production is met.

[0067] Optionally, the first syringe 5 and the second syringe 6 form a T-shaped or Y-shaped structure.

[0068] Specifically, from Figure 2As can be seen, the first syringe 5 and the second syringe 6 form a T-shape. In other embodiments, the first syringe 5 and the second syringe 6 can also have a Y-shaped structure, which allows the micro-injection pump to simultaneously meet the needs of large-capacity storage and high-precision extrusion. The main body (first syringe 5) is a straight cylindrical structure for precise extrusion, while the branch portion connects to a large-capacity storage container (second syringe 6).

[0069] The working principle of a micro-injection pump relies on a sophisticated motor control system that precisely controls the movement of the needle. During the delivery of liquid-curing material, a large-capacity storage container feeds the liquid-curing material into a linear cylindrical structure, while the needle retracts to accommodate new resin. During extrusion, the valve of the large-capacity storage container is first closed or its needle is locked. Then, the motor control system pushes the needle in the linear cylindrical structure, thereby achieving precise extrusion of liquid-curing material droplets. High-precision extrusion relies on the precise step control of the motor control system, allowing control over every minute movement of the needle. This control can be achieved through a programmable electronic controller, ensuring that the amount of liquid-curing material droplets extruded each time meets the requirements for microlens formation.

[0070] Optionally, the three-axis control structure 2 is a linear axis structure. Figure 1 (As shown), a Delta-type structure or a polar coordinate system structure; wherein, the linear axis structure includes three sets of linear guides, each set of guides corresponding to a coordinate axis of a Cartesian coordinate system, and movement along each axis is achieved through a stepper motor and a lead screw transmission mechanism; the Delta-type structure includes three motors fixed on the top of the 3D printing equipment, and the curing agent extrusion structure 3 is controlled in three-dimensional space by controlling the length changes of the three arms connected to the curing agent extrusion structure 3; the polar coordinate system structure is achieved by combining the rotation of the base lens 4 and the height movement of the curing agent extrusion structure 3 along the radial direction of the base lens 4 and perpendicular to the surface of the base lens 4.

[0071] Specifically, the three-axis control structure 2 may include a linear axis structure, a Delta-type structure, or a polar coordinate system structure;

[0072] Linear axis structure: It consists of three sets of linear guides, each set corresponding to a coordinate axis (X, Y, Z axis), and achieves precise movement along each axis through a stepper motor and a lead screw transmission mechanism. This structure is suitable for applications requiring high-precision linear movement.

[0073] Delta structure: Contains three motors fixed at the top. By controlling the length changes of the three arms connected to the extruder head, the extruder head can be controlled in three-dimensional space. The advantage of the Delta structure is its fast and smooth movement capability, making it suitable for high-speed operation.

[0074] Polar coordinate system structure: This is achieved by combining the rotation of a lens with an extrusion head that moves radially and vertically (Z-axis). The polar coordinate system structure allows the extrusion position to be adjusted by rotating the base lens, while the radial and Z-axis movements are achieved through a stepper motor and lead screw mechanism similar to a linear axis structure.

[0075] Working principle of three-axis control structure 2:

[0076] Regardless of the structural form chosen (i.e., linear axis structure, Delta structure, and polar coordinate system structure), the three-axis control mechanism is driven by a precise motor control system. Stepper motors provide the system with positioning accuracy, with each step corresponding to a specific position in three-dimensional space. Through programming of the electronic controller, the number of steps and direction of each motor can be precisely controlled, thereby achieving precise extruder head position control in XYZ three-dimensional space.

[0077] Figure 3 This is a schematic diagram of an extrusion quantity algorithm for liquid-cured material in a 3D printing device provided in an embodiment of the present invention. (Refer to...) Figure 3 The extrusion quantity algorithm for the 3D printing equipment provided in this embodiment of the invention is as follows:

[0078]

[0079]

[0080] H1=R(1-cosα1)

[0081] H0=R0(1-cosα0)

[0082] R sinα1=R0 sinα0

[0083] V = V1 - V0

[0084] α=α0-α1

[0085] In the above formula:

[0086] R0 is the radius of curvature of the base lens, which is a known parameter;

[0087] α is the contact angle between the photosensitive resin and the base lens, which is determined by the properties of the photosensitive resin material and the base lens material, and is also a known parameter;

[0088] V is the volume of the microlens, which is the volume of photosensitive resin squeezed out through a micro-syringe. It can be controlled by a micro-syringe pump and is a known parameter.

[0089] R is the radius of curvature of the microlens, which is the variable to be solved.

[0090] Based on the above formula, the result of R can be numerically solved.

[0091] For example, R0 = 200 mm, α = 1 0 When V = 1 μL, substituting the values, we can obtain R = 21.382 mm. At this time, the diameter of the microlens is about 0.82 mm and the height of the microlens is about 3 μm, which is very close to that of common microlenses.

[0092] Generally speaking, the most critical parameter is the optical zone size, which is the closest distance from the inner edge of the microlens to the center of the lens.

[0093] Doctors can first use some measurement methods to measure the patient, such as trial lenses with different distributions of microlenses, to test the patient's tolerance. Alternatively, they can use existing technologies, such as the Zeiss intraocular lens biometer, to measure the patient's corneal curvature and anterior chamber depth, and select the microlens placement and distribution, such as the optical zone size, based on experience.

[0094] Then, based on the doctor's prescription, the manufacturer can use this invention to additively manufacture more microlenses on a base lens that already has a certain number of microlenses. For example, if the doctor's prescription is for an optical zone diameter of 6mm, and the microlenses on a base lens that already has a certain number of microlenses are distributed starting from 9mm, the manufacturer can use additive manufacturing to add microlenses between 6mm and 9mm.

[0095] This invention also provides an eyeglass lens. Figure 4 This is a top view schematic diagram of a spectacle lens structure provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of the side view structure of a spectacle lens provided in an embodiment of the present invention, with reference to... Figures 4-5 It includes a base lens 4 and a plurality of microlenses 81 located on at least one side of the base lens 4.

[0096] For details, please refer to Figure 4 The spectacle lens includes an optical region 7 located at the center of the lens and a microlens region 81 surrounding the optical region 7; Reference Figure 5 The spectacle lens includes a base lens 4 and multiple microlenses 81 located on one side of the surface of the base lens 4. An optical zone 7 is set at the center of the lens to ensure that the user can see things clearly, and without affecting the myopia control of the axial cone lens while ensuring a clear field of vision.

[0097] This invention also provides a method for preparing spectacle lenses. Figure 6 This is a flowchart illustrating a method for manufacturing an eyeglass lens according to an embodiment of the present invention. The eyeglass lens is manufactured using any of the 3D printing devices described in the above embodiments. The manufacturing method includes:

[0098] S1. Provide a basic lens;

[0099] S2. Fix the base lens onto the base lens fixing structure;

[0100] S3. The three-axis control structure adjusts the position of the curing agent extrusion structure so that the tip of the micro-injection pump contacts the surface of the base lens.

[0101] S4. The lens height positioning structure adjusts the distance between the tip of the micro-injection pump and the surface of the base lens by a preset distance.

[0102] S5. A micro-injection pump extrudes microliter-level droplets of liquid solidification material onto the surface of the base lens.

[0103] S6. Repeat steps S3 to S5 to form multiple liquid solidification material droplets on the base lens;

[0104] S7. The curing structure solidifies the liquid curing material droplets on the surface of the base lens into microlenses.

[0105] The present invention provides a method for preparing eyeglass lenses, which uses the 3D printing equipment provided in any of the above embodiments to prepare eyeglass lenses with microlenses. The eyeglass lenses can provide each patient with customized eyeglass lenses with microlenses, and reduce the cost of manufacturing lenses, thereby reducing the economic burden on users.

[0106] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A 3D printing device, characterized in that, This includes the basic lens fixing structure, the triaxial control structure, the curing agent extrusion structure, the lens height positioning structure, and the curing structure; The base lens fixing structure is used to fix the base lens; The triaxial control structure is connected to the curing agent extrusion structure and is used to adjust the position of the curing agent extrusion structure; The curing agent extrusion structure contains a liquid curing material, and the curing agent extrusion structure includes a micro-injection pump, which is used to extrude microliter-level liquid curing material droplets onto the surface of the base lens. The lens height positioning structure is connected to the micro-injection pump and is used to adjust the distance between the tip of the micro-injection pump and the surface of the base lens. The curing structure is used to solidify the liquid curing material droplets on the surface of the base lens into microlenses.

2. The 3D printing equipment according to claim 1, characterized in that, The micro-injection pump includes a first syringe and a second syringe. The volume of the first syringe is smaller than that of the second syringe. The output end of the first syringe is used to output microliter-level liquid solidification material droplets. The output end of the second syringe is connected to the empty cylinder of the first syringe.

3. The 3D printing equipment according to claim 2, characterized in that, The output end of the first syringe is provided with a first valve or a first blocking device, which is closed when not extruding and open when extruding; The output end of the second syringe is provided with a second valve or a second blocking device, which is open when not extruding and closed when extruding.

4. The 3D printing equipment according to claim 2, characterized in that, The first syringe and the second syringe form a T-shaped or Y-shaped structure.

5. The 3D printing equipment according to claim 1, characterized in that, The three-axis control structure can be a linear axis structure, a Delta type structure, or a polar coordinate system structure. The linear axis structure includes three sets of linear guides, each set of guides corresponding to a coordinate axis of a rectangular coordinate system, and movement along each axis is achieved through a stepper motor and a lead screw transmission mechanism; The Delta-type structure includes three motors fixed to the top of the 3D printing equipment. By controlling the length changes of the three arms connected to the curing agent extrusion structure, the curing agent extrusion structure can be controlled in three-dimensional space. The polar coordinate system structure is achieved by combining the rotation of the base lens with the movement of the curing agent extrusion structure along the radial direction of the base lens and at a height perpendicular to the surface of the base lens.

6. The 3D printing equipment according to claim 1, characterized in that, The lens height positioning structure includes a distance sensor, which is used to determine the distance between the tip of the micro-injection pump and the surface of the base lens.

7. The 3D printing equipment according to claim 1, characterized in that, The liquid-curing material includes photosensitive resin or thermosensitive resin.

8. The 3D printing equipment according to claim 7, characterized in that, The liquid curing material includes a photosensitive resin, and the curing structure includes an ultraviolet light source; or the liquid curing material includes a thermosensitive resin, and the curing structure includes a heater.

9. A method for preparing a spectacle lens, characterized in that, The spectacle lens is fabricated using the 3D printing equipment according to any one of claims 1 to 8, and the fabrication method includes: S1. Provide a basic lens; S2. Fix the base lens onto the base lens fixing structure; S3. The three-axis control structure adjusts the position of the curing agent extrusion structure so that the tip of the micro-injection pump contacts the surface of the base lens. S4. The lens height positioning structure adjusts the distance between the tip of the micro-injection pump and the surface of the base lens at a preset distance. S5. The micro-injection pump expels microliter-level liquid solidification material droplets onto the surface of the base lens. S6. Repeat S3~S5 to form multiple liquid solidification material droplets on the base lens; S7. The curing structure solidifies the liquid curing material droplets on the surface of the base lens into microlenses.

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